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Derwent Chemistry Resource (DCR) - STN International

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Why are both the CAS files and <strong>Derwent</strong> World<br />

Patents Index required for comprehensiveness?<br />

• CAS and Thomson apply different indexing<br />

guidelines to chemical patent publications<br />

– Different compounds are selected from the claims and<br />

the description for substance specific indexing<br />

• Patent authority, document type and historical<br />

coverage varies between CAplus and DWPI<br />

• Timeliness of coverage and indexing<br />

• For a particular invention CAS and Thomson<br />

index the basic patent publication<br />

– The basic patent may vary for CAplus and DWPI<br />

– The patent content is dependent on the family<br />

member<br />

59

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